the fbi says it will now investigate the death of our four american diplomats in libya. i'm steve handelsman reporting. now back to you. >> thank you, steve. >>> muslim-american leaders here in washington are also condemning what they describe as the disaceful killings of american diplomats. >> the killers of our diplomats deserve condemnation and should be brought to justice. this attack is inexcusable, and cannot be justified under any justification. >> the local leaders also called on muslims in the middle east to ignore the film that apparently triggered the violent protest. >>> there is a lot going on behind the scenes right now, as u.s. officials respond to the killing of ambassador stevens and the three other american diplomats. nbc news white house correspondent mike vicaro joins us with the latest. mike, first of all, is there any word on any -- any additional word from the white house on who's behind the attack? >> reporter: well, it's being investigated but i can tell you that they are warning our white house officials not to jump to the conclusion -- remember